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ETA text displays incorrect values for negative seconds

ETA text displays incorrect values for negative seconds: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). When using the eta text function with negative seconds, it should return a question mark ? to indicate an unknown ETA. However, it's currently trying to…

The task

When using the `eta_text` function with negative seconds, it should return a question mark `?` to indicate an unknown ETA. However, it's currently trying to format negative seconds as a time display, which doesn't make sense for an ETA.

Part of keryszhan/harbor-swesmith-rl-artifacts.